Geological Era

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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Era, Geological

 

an interval of time in the earth’s geological history, during which an erathem formed. Eras are subdivided into periods; several eras combine to form an eon. There are three eras in the most recent Phanerozoic eon: the Paleozoic, Mesozoic, and Cenozoic eras. (See alsoGEOCHRONOLOGY.)

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.